Qatar has used its wealth to adopt policies sometimes rivaling Saudi Arabia’s. Think, for example, of the popular Al-Jazeera. Now the Saudis seem determined to limit Qatari influence as much as possible.

New tools help doctors and breast cancer patients decide whether chemotherapy is needed. A recent study suggested that many can forgo chemo. But the decision is complicated. Here's why.

Volume rendered image of the external morphology of the foot bone shows the extent of expansion of the primary bone cancer beyond the surface of the bone.
Patrick Randolph-Quinney (UCLAN)August 10, 2016

Cancer is a deadly disease and would have been particularly lethal before the recent development of effective treatments. So why didn’t it – or our susceptibility to it – die out long ago?

Visitors walk past a field of United States flags displayed by the Massachusetts Military Heroes Fund on the Boston Common. The 37,000 flags are planted in memory of every fallen Massachusetts service member from the Revolutionary War to the present.
REUTERS/Brian SnyderMay 30, 2016

The culture all veterans share may provide the best support for those struggling with mental health issues.

Civilian doctors might not know that their patients have served in the military. In this photo Marines march around the World Trade Center memorial after participating in a memorial run in 2012.
MarineCorps NewYork/FlickrJanuary 21, 2016

Menstruation is a reproductive quirk that humans share with only a few other mammals. But even stranger is the fact that women stop menstruating when they have a whole third of their lives left to live…